For 1993, the auxiliary fan only works when the A/C pressure is very high -- not all the time -- even with the A/C running.
And it isn't at all influenced by coolant temperature!
However, in an article I wrote that was published in the VCOA's magazine, Rolling ("Improving the Auxiliary Radiator Fan", July/August 2007, pg 25), you can install a simple wire cable from Volvo (part of an official TSB) that costs only ~$7.00 and that will put the control of the fan under both A/C pressure and also coolant temperature. The whole job takes about 5 minutes, not counting removing and reinstalling the splash pan (unless you have long arms).
The catch is that you need to already have a Nissen 3-row (or other radiator) that has the coolant temperature thermoswitch. Otherwise, it's more involved and costly.
BTW, the TSB is 26905-2 (95-04-01) -- but you shouldn't need this -- and the cable's p/n -- which you need if you have a thermoswitch -- is 9148986-4.
And Nissen's thermoswitch (Nissen's part no. 80600) which is in their radiators closes the circuit at 92 C/198 F, and opens at 82 C/180 F.
Good luck.
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